Parameters:
catalog - a catalog name; must match the catalog name as it is stored in the database; "" retrieves those without a catalog; null means that the catalog name should not be used to narrow the search
schema - a schema name; must match the schema name as it is stored in the database; "" retrieves those without a schema; null means that the schema name should not be used to narrow the search
table - a table name; must match the table name as it is stored in the database
Returns:
ResultSet - each row is a primary key column description
Throws:
SQLException - if a database access error occurs